diff options
Diffstat (limited to 'doc/book/src/connect')
| -rw-r--r-- | doc/book/src/connect/repositories.md | 114 |
1 files changed, 113 insertions, 1 deletions
diff --git a/doc/book/src/connect/repositories.md b/doc/book/src/connect/repositories.md index 1e6d2f4f..9c88ca3e 100644 --- a/doc/book/src/connect/repositories.md +++ b/doc/book/src/connect/repositories.md @@ -1 +1,113 @@ -# Repositories (Docker, Nix...) +# Repositories (Docker, Nix, Git...) + +## Sourcehut + +## Gitlab + +## Gitea & Gogs + + +## Docker + +Not yet compatible, follow [#103](https://git.deuxfleurs.fr/Deuxfleurs/garage/issues/103). + +## Nix + +Nix has no repository in its terminology: instead, it breaks down this concept in 2 parts: binary cache and channel. + +**A channel** is a set of `.nix` definitions that generate definitions for all the software you want to serve. + +Because we do not want all our clients to compile all these derivations by themselves, +we can compile them once and then serve them as part of our **binary cache**. + +It is possible to use a **binary cache** without a channel, you only need to serve your nix definitions +through another support, like a git repository. + +As a first step, we will need to create a bucket on Garage and enabling website access on it: + +```bash +garage key new --name nix-key +garage bucket create nix.example.com +garage bucket allow nix.example.com --read --write --key nix-key +garage bucket website nix.example.com --allow +``` + +If you need more information about exposing buckets as websites on Garage, +check [Exposing buckets as websites](/cookbook/exposing_websites.html) + and [Configuring a reverse proxy](/cookbook/reverse_proxy.html). + +Next, we want to check that our bucket works: + +```bash +echo nix repo > /tmp/index.html +mc cp /tmp/index.html garage/nix/ +rm /tmp/index.html + +curl https://nix.example.com +# output: nix repo +``` + +### Binary cache + +To serve binaries as part of your cache, you need to sign them with a key specific to nix. +You can generate the keypair as follow: + +```bash +nix-store --generate-binary-cache-key <name> cache-priv-key.pem cache-pub-key.pem +``` + +You can then manually sign the packages of your store with the following command: + +```bash +nix sign-paths --all -k cache-priv-key.pem +``` + +Setting a key in `nix.conf` will do the signature at build time automatically without additional commands. +Edit the `nix.conf` of your builder: + +```toml +secret-key-files = /etc/nix/cache-priv-key.pem +``` + +Now that your content is signed, you can copy a derivation to your cache. +For example, if you want to copy a specific derivation of your store: + +```bash +nix copy /nix/store/wadmyilr414n7bimxysbny876i2vlm5r-bash-5.1-p8 --to 's3://nix?endpoint=garage.example.com®ion=garage' +``` + +*Note that if you have not signed your packages, you can append to the end of your S3 URL `&secret-key=/etc/nix/cache-priv-key.pem`.* + +Sometimes you don't want to hardcode this store path in your script. +Let suppose that you are working on a codebase that you build with `nix-build`, you can then run: + +```bash +nix copy $(nix-build) --to 's3://nix?endpoint=garage.example.com®ion=garage' +``` + +*This command works because the only thing that `nix-build` outputs on stdout is the paths of the built derivations in your nix store.* + +You can include your derivation dependencies: + +```bash +nix copy $(nix-store -qR $(nix-build)) --to 's3://nix?endpoint=garage.example.com®ion=garage' +``` + +Now, your binary cache stores your derivation and all its dependencies. +Just inform your users that they must update their `nix.conf` file with the following lines: + +```toml +substituters = https://cache.nixos.org https://nix.example.com +trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= nix.example.com:eTGL6kvaQn6cDR/F9lDYUIP9nCVR/kkshYfLDJf1yKs= +``` + +*You must re-add cache.nixorg.org because redeclaring these keys override the previous configuration instead of extending it.* + +Now, when your clients will run `nix-build` or any command that generates a derivation for which a hash is already present +on the binary cache, the client will download the result from the cache instead of compiling it, saving lot of time and CPU! + + +### Channels + +Channels additionnaly serve Nix definitions, ie. a `.nix` file referencing +all the derivations you want to serve. |